Bevel



(No Model.)

,.I. W. H. DOUBLBR.

BEVEL.

Unirse .l STATES ArnNr Fries.

JOHN W. H. DOUBLEB, OF ROCKFORD, ILLINOIS.

BEVEL.

' SPECIFICATION forming part of Letters Patent No. 316,341, dated April 21, 1885.

Application tiled June 20, 1F84.

and State of Illinois, have inventeda new anduseful Bevel, of which the following is a speciication.

This invention relates to bevels in which the blade has a pivotal connection with the stock for the purpose of adjustment; and the object of this invention is to produce a bisectingbevel, made adjustable to bisect angles, and capable of use as an ordinary adjustable bevel and as a T-square; and itconsists, mainly, of a stock and two blades having a gear-toothed end connection pivotally connected to the end of the stock in such a manner that their swinging movements shall be in unison in opposite directions. Y

ln the accompanying drawings, Figure l is a face view of my improved bevel with the blades in line at right angles to the stock. Fig. 2 is an isometrical representation of my improved bevel with blades closed. Fig. 3 is a transverse section on dotted line :z: on Fig. 2; and Fig. 4 is an isometrical representation of the clampingplate.

In the figures, A represents the stock of the bevel, which is rectangular in cross-section, and of suitable dimensions, and preferably of suitable wood. One side of this stock is fitted with a metallic plate, B, and the opposite side of one end thereof is fitted with a metallic plate, C. This plate end of the stock is produced in the double-rounded'fo'rm shown in the drawings, and the axial centers of these rounded portions are bored to receive pivotjournals of the blades.

At D are represented the metallic blades, preferably of steel, in this instance slightly less than half the width of the stock. The pivoted ends of these blades are produced in semicircular form, and are fitted with spur gear-teeth. The gear-toothed ends of these blades are each fitted with a stud-journal, E, projecting from the center of the circle, at right angles with the blade. These stud -journals E are fitted to enter the bored axial centers of the double-rounded ends of the stock snugly, in a manner to permit the blades to oscillate or swing on their pivotal connection (Nomodel.)

toothed ends of the blades D are such that the pitch-lines of their toothed portions shall coincide, and'their gear-teeth are such as to prevent backlash, and to cause the blades to move in unison, or to have a sameness of movement in opposite directions, and capable of folding on the metallic face of the stock, in which position their outer edges will coincide with the outer-edge sides of the stock, and their inner edges parallel with each other centraly on the metallic face thereof. These blades are also capable of an outward-swinging forward movement to a position nearly parallel with the stock. The free projecting end portions of the stud-journals are provided with an annular groove, F.

At H is represented a clamping-bar, employed to x lthe parts in place. The ends of this clamping-bar H are provided with slots of unequal lengths to receive the neckings of the grooved portion of the stu l-journals in a manner to permit the plate to be put in place to fix the parts and to be readily removed to permit their separation. This clamping-bar is provided with a clamping-screw, I, having a screw-thread connection with the central portion of theA bar. The end of this clamping-screw I is reduced to stud-pin form, as shown at K, to enter a hole inthe plate C in such a manner as to hold the plate in position, and that the shoulder formed on the screw in producing the stud-pin Kshall engage the upper surface of the plate. By this construction it will be seen that, when the screw is turned inward,.the clamping-bar, by reason of its connection with the stud-pins of the blades, will operate to clamp the blades to the stock to tix them in their adjusted position, and the reverse movement of the screw will free the blades to permit them to turn freely on their pivotal connect-ion with the stock.

This construction permits the adjustment of .the blades to any angle within the limits of the device as an ordinary adjustable bevel, and when the blades are adjusted to any angle within their limits such angle will be bisected by the edge lines of the stock.

In the use of my improved bevel as a tool for mechanical or other purposes, where it is required to bisect angles, to lay out or cut miters of various internal or external angles, the

roo

therewith. The diameters of the rounded pivoted blades are adjusted either forward or backward to the angle, and in every instance the edge lines of the stock relatively with the blades Will represent the miter-line, or the line bisecting the angle to which the blades are adjusted. The metallic face of the stock on one side is graduated in degree-divisions for the purpose of adjusting the blades relative with the stock to any angle named by degrees Within the limits of the scale, and the blades relatively with each other to twice the angle measured by the degrees represented on the scale.

I claim as my invention- 1. The combination of the stock and the two blades, said blades having a pivotal connection with the stock and a gear-toothed connection with each other, substantially as and for the purpose set forth.

2. The combination, with the grooved studjournals, of a clamping-bar slotted to engage the grooved portions ofthe journals, and made removable, substantially as and for the purpose set forth.

3. The combination, with the stock and with the slotted clamping-bar, to engage the studjournals ofthe blades, of a clamping-screw having a screw-thread connection with the clamping-bar and a pin-stud connection with the stock, substantially as and for the purpose set forth.

4. The combination, with the blades geared at their pivotal ends to move together, of a stock provided at one side with a graduated scale, substantially as set forth.

JOHN W. H. DOUBLER.

Witnesses:

A. O. BEHEL, JACOB BEHEL. 

